0.4.9: pytest is failing

I'm packaging your module as an rpm package so I'm using the typical PEP517 based build, install and test cycle used on building packages from non-root account.
- `python3 -sBm build -w --no-isolation`
- because I'm calling `build` with `--no-isolation` I'm using during all processes only locally installed modules
- install .whl file in
- run pytest with PYTHONPATH pointing to sitearch and sitelib inside

Here is list of installed modules in build env

```console
Package Version
----------------------------- -----------------
alabaster 0.7.12
appdirs 1.4.4
asttokens 2.0.5
attrs 22.1.0
Babel 2.11.0
backcall 0.2.0
beautifulsoup4 4.11.1
bleach 5.0.0
Brlapi 0.8.3
build 0.9.0
charset-normalizer 3.0.0
codespell 2.2.1
contourpy 1.0.5
cssselect 1.1.0
cycler 0.11.0
debugpy 1.6.3
decorator 5.1.1
defusedxml 0.7.1
distro 1.7.0
dnspython 2.2.1
docutils 0.18.1
entrypoints 0.4
executing 1.1.1
extras 1.0.0
fastjsonschema 2.16.1
fixtures 4.0.0
fonttools 4.38.0
gpg 1.17.1-unknown
html5lib 1.1
hypothesis 6.41.0
hypothesmith 0.2.0
idna 3.4
imagesize 1.4.1
importlib-metadata 5.0.0
importlib-resources 5.9.0
iniconfig 1.1.1
ipykernel 6.17.1
ipython 8.5.0
jedi 0.18.1
Jinja2 3.1.1
jsonschema 4.17.0
jupyter_client 7.4.5
jupyter_core 5.0.0
jupyterlab-pygments 0.1.2
kiwisolver 1.4.4
lark 1.1.4
libcomps 0.1.19
libcst 0.3.20
louis 3.23.0
lxml 4.9.1
MarkupSafe 2.1.1
matplotlib 3.6.0
matplotlib-inline 0.1.5
mistune 2.0.4
mypy-extensions 0.4.3
nbclient 0.7.0
nbconvert 7.2.2
nbformat 5.7.0
nbsphinx 0.8.9
nest-asyncio 1.5.6
numpy 1.23.1
olefile 0.46
packaging 21.3
pandocfilters 1.5.0
parso 0.8.3
pbr 5.9.0
pep517 0.13.0
pexpect 4.8.0
pickleshare 0.7.5
Pillow 9.2.0
pip 22.2.2
pkgutil_resolve_name 1.3.10
platformdirs 2.5.2
pluggy 1.0.0
prompt-toolkit 3.0.29
psutil 5.9.2
ptyprocess 0.7.0
pure-eval 0.2.2
py 1.11.0
Pygments 2.13.0
PyGObject 3.42.2
pyparsing 3.0.9
pyrsistent 0.19.2
pytest 7.1.3
python-dateutil 2.8.2
pytz 2022.4
PyYAML 6.0
pyzmq 24.0.0
requests 2.28.1
rpm 4.17.0
scour 0.38.2
semantic-version 2.9.0
setuptools 65.5.1
setuptools-rust 1.5.2
setuptools-scm 7.0.5
six 1.16.0
snowballstemmer 2.2.0
sortedcontainers 2.4.0
soupsieve 2.3.2.post1
Sphinx 5.3.0
sphinx-rtd-theme 1.1.0
sphinxcontrib-applehelp 1.0.2.dev20220730
sphinxcontrib-devhelp 1.0.2.dev20220730
sphinxcontrib-htmlhelp 2.0.0
sphinxcontrib-jsmath 1.0.1.dev20220730
sphinxcontrib-qthelp 1.0.3.dev20220730
sphinxcontrib-serializinghtml 1.1.5
stack-data 0.5.1
testtools 2.5.0
tinycss2 1.2.1
tomli 2.0.1
tornado 6.2
traitlets 5.4.0
typing_extensions 4.3.0
typing-inspect 0.7.1
urllib3 1.26.12
wcwidth 0.2.5
webencodings 0.5.1
wheel 0.37.1
zipp 3.9.0
```